I'm not a 3-railer, and I couldn't get any time off to attend the convention (ironically, as I joined the NMRA specifically to attend it), but I will be going with some pals to the National Train Show tomorrow. I live less than 100 miles north of Portland, so it's not that bad a drive.
It's not going to be very good weather, though: http://forecast.weather.gov/Ma...5.59707#.VeCIEi_JDL8 I'll probably be driving right through the worst of the weather tomorrow morning to get there, then we'll be hitting all the hobby shops we can (and maybe the enginehouse with 4449/700 and the ALCO PA in it over by OMSI) as time (and any damage from the storm) allows.